[SQL] SPARK-1964 Add timestamp to hive metastore type parser.

Author: Michael Armbrust <michael@databricks.com>

Closes #913 from marmbrus/timestampMetastore and squashes the following commits:

8e0154f [Michael Armbrust] Add timestamp to hive metastore type parser.

sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala

@@ -190,6 +190,7 @@ object HiveMetastoreTypes extends RegexParsers {
     "binary" ^^^ BinaryType |
     "boolean" ^^^ BooleanType |
     "decimal" ^^^ DecimalType |
+    "timestamp" ^^^ TimestampType |
     "varchar\\((\\d+)\\)".r ^^^ StringType
 
   protected lazy val arrayType: Parser[DataType] =